For a forthcoming national magazine article (for an issue on the "state of suburbia"), I am researching the phenomenon of the blurring lines between suburban and urban regions. The distinction has always been fraught with some ambiguity -- and explored in works ranging from Edge Cities to Postsuburban California -- but recently there seems to be a kind of spatial-societal displacement whereby some suburbs are exhibiting qualities of cities and vice versa. In the Chicago suburb of Arlington Heights, for example, the built-out municipality is seeing the construction of urban-like high-rise building; in Chicago, meanwhile, the strip-mall form is enjoying something of a heydey. In Atlanta, residents report not knowing where the city begins or ends. Nationally, crime is down in urban regions while it is rising in suburban regions. Big-box retail is appearing in cities while struggling 70s-era malls are converted in urban-like "town square" developments. Sprawl is now affecting other suburbs more than central cities. I wonder if list participants might have any compelling examples of such reversals, or any thoughts on why some of these changes are occuring, or the future of the urban-suburban bifurcation.